I use 35gr of Varget for 3900fps with Hornady 50gr V-Max. This is 2-3gr below max. This is out of a 700 VLS with 1:14tw 26in barrel. Varget and R15 are cleaner than H380. 1:14 likes 40-55gr the best. But a 60gr wouldn't be bad, I am sure the 53gr is shorter than the 60.

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When all is said and done, there is a lot more said than done.